CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
APU ENGINE OIL PRESSURE GAGE CIRCUIT--Continued
WARNING
Remove all jewelry such as rings, dog tags,
bracelets, etc. If jewelry contacts a metal
surface a direct short may result in instant
heating of tools, damage to equipment, and
injury or death to personnel.
F Reconnect wire 419 to panel connector side of 15 A
circuit breaker. Disconnect wire 419 from APU FUEL
SHUTOFF switch side of 15 A circuit breaker. Place red
lead of multimeter on terminal of circuit breaker and
black lead to ground. Turn MASTER switch on and
check for voltage. Turn MASTER switch OFF. If voltage
is present, go to step G. If voltage is not present, replace
15 A circuit breaker (see paragraph 13-7).
G Reconnect wire 419 to 15 A circuit breaker. Disconnect
wire 419 from circuit breaker side of APU FUEL
SHUTOFF switch. Place red lead of multimeter in wire
419 and black lead to ground. Turn MASTER switch on
and check for voltage. Turn MASTER switch OFF. If
voltage is present, go to step H. If voltage is not present,
repair/replace wire 419 of APU fuel shutoff lead
assembly (see paragraph 13-7).
H Reconnect wire 419 to circuit breaker side of APU FUEL
SHUTOFF switch. Disconnect wire 421 from APU FUEL
SHUTOFF switch. Place red lead of multimeter on
terminal of APU FUEL SHUTOFF switch and black lead
to ground. Turn MASTER and APU FUEL SHUTOFF
switches ON and check for voltage. Turn MASTER and
APU FUEL SHUTOFF switches OFF. If voltage is
present, go to step I. If voltage is not present, replace
APU FUEL SHUTOFF switch (see paragraph 13-7).
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